Got this test set because it allows hands free talking and listening unlike the common buttset (Wiki) which requires either hand holding or craning your neck.
Note that when using a buttset in a crossover box (Wiki) the telephone number of the pairs is not part of the marking. So you need to use ANAC (Wiki) phone numbers, like 959-1122, 959-1114 or others which tell you which number you are calling from. This is also very useful when you are wiring a building so that you can connect a given number to a specific telephone set.
Although this test set has a12 button keypad and you can select either pulse or DTMF (Wiki) dialing, it only has last number redial when in pulse mode and when the internal 9V battery is installed (if the test set is disconnected from the line). It also supports Ground Start (Wiki). There is a 577 Hz test tone generator that also requires the internal battery. But all the other functions operate without the battery.
Fig 1 Complete Test Set
Fig 2 Plantronics StarSet HS0556-1
With Switch marked I II III
Fig 7 Test Cord with insulation piercing spike but no bed of nails
471A female connector accepts standard phone tip plugs.
There are three parts to the test set:
Test Set Body
Made utilizing integrated circuits and printed circuit boards.
The 471A dual female connector connects to the test set. The test set has a couple of phone tip plugs
Pacific Plantronics Inc. StarSet HS0556-1, 1188 C
Uses two 1/4" phone plugs and is wired with sleeves going to the speaker and tips wired to the mike (BSP 028-351-501 KS 20778) so that it does not matter which way it's plugged in. There is a switch marked I, II, III, what does it do? If you have any information on this please let me know.
Note this headset uses ear muff type speakers but the date code 1188 seems to indicate it was made long after the ear supported style was popular, so maybe made to a Bell System specification?
Acoustic apparatus, Pacific Plantronics Inc, Feb 9, 1965, 381/338, 181/158- mike not in front of mouth where it would pickup breath noise, but instead remotely located with noise reduction features.
Miniature headset-microphone adapted for use with a mask,Pacific Plantronics Inc, May 18, 1965, 379/430 - uses hollow tubes to carry voice to microphone and to carry sound to ear.
Acoustic noise attenuating apparatus,Pacific Plantronics Inc, Jun 18, 1968, 181/158, 381/338, 381/354, 181/21 - absorbing material at tip of mike boom
Earform mold for supporting acoustic apparatus on a wearer's ear and method of making the mold, Pacific Plantronics Inc, May 19, 1970,
381/330, 425/110, 425/182, 264/222, 425/2 -
Electroacoustic apparatus, Pacific Plantronics Inc, Aug 18, 1970, 379/430 - replaces muff type headphones with in-ear direct porting of sound
3602653 Electroacoustic transducer mount, Pacific Plantronics Inc,Aug 31, 1971, 381/368, 381/375, 381/376 - improved isolation between speaker and mike
Self-supporting headset, Pacific Plantronics Inc,Dec 15, 1970, 379/430 - support only on ear, no headband, no custom molding to fit ear
Self-supporting headset, Pacific Plantronics Inc, Oct 5, 1971, 379/430, 381/381, 381/375, 381/330 - support only on ear, no headband
3654404 Headset cradle , Pacific Plantronics Inc, Apr 4, 1972, 379/450 - clips to side of a 500 or 2500 telephone set for storing headset
Cable strain relief device Sep 14, 1971, 24/332, 24/600.6, 24/115.00G - allows easily changing where the clip is along the cable , Pacific Plantronics Inc,
Support needed as small force can knock headset off of ear.
Telephone user set , Pacific Plantronics Inc, Sep 12, 1972, Harris Telephone Test, 379/294, 381/107, 379/395 - automatic volume control to suppress noise when no voice
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Brooke's: PRC68, Alphanumeric index of web pages, Contact, Products for sale
This page created on 16 Sep 2014